Porsche CARRERA GT-2004 Manual page 151

Winter driving
There are no snow tires approved for the vehicle.
Snow chains
Caution!
Risk of damage to body, axle or brake com-
ponents.
f Fit snow chains only to the rear wheels.
To ensure adequate clearance between chain
and body, Porsche recommends only the use
of fine-link chains such as those approved by
Porsche.
f Follow instructions issued by the supplier of
the chains.
Different states and countries have varying statu-
tory requirements regarding maximum speed.
Check with local authorities for possible restric-
tions.
f Remove chains as soon as the roads are free
of ice and snow.
Tire designations
The designation to be used for ZR tires is e.g.
335/30 ZR 20 (Z = code letter for radial tires for
speeds above 150 mph / 240 km/h).
151
Practical Tips, Emergency Service